Why are my two front teeth of different sizes?

Width or length?: If different widths, probable genetic cause. If different lengths, probably malocclusion. See your dentist and ask if you should see an orthodontist or if it is a problem that would be best resolved restoratively.

If different length: You may have excess gum covering the tooth thereby making it look shorter. Often a simple 5 minute laser treatment can correct this problem. See your dentist for an evaluation.

Passive eruption: It is usually caused by excess gum. If it bothers you, have it evaluated. It may be a simple fix.

Wear: Another cause can be wear, or erosion. This can be related to your bite or your habits. . A good dental evaluation is needed to find the cause of the front teeth problem and then discuss strategies to fix this and getting you looking better.

We are not : Bilaterally symmetrical, by that i mean we are not mirror images of each side. Normal variations exist throughout our bodies. If its of concern, speak with your dentist -- there are a lot of cosmetic options available to make your smile as perfect as you would like it to be. Hope this helps.